Interlinkages Between Private and Public Debt Overhangs∗

Interlinkages between Private and Public Debt Overhangs∗ Nicoletta Batiniy Giovanni Melinaz Stefania Villax November 9, 2015 Abstract The debate about a country’s appropriate level of public debt in the medium run continues to rage, and it remains unclear whether high debt is a cause or a consequence of low economic growth. By combining the financial accelerator literature with that on sovereign risk premia and fiscal limits, we build a model with borrowing constraints that produces leverage cycles, and embeds links between private and public debt dynamics. The model is calibrated on average euro area data and tracks well recent leverage dynamics. Four key results emerge. First, high private debt—rather than high public debt—is a more serious source of macro-fiscal vulnerability, because it leads to bigger contractions and deflations in response to adverse shocks. Second, when fiscal buffers are available, the government should always intervene to relax borrowing constraints of the private sector, and mitigate the consequences of deleveraging. Third, during deleveraging, first best monetary and fiscal stances should not exceed the minimum necessary to anchor inflation expectations and stabilize government debt. Too much fiscal austerity delays the return to macro-fiscal stability, and raises the likelihood of new fallouts, especially if monetary policy is at the zero lower bound. Fourth, the optimal macro-prudential policy is given by the loan-to-value ratio that delivers the most output-friendly leverage cycle. Keywords: Public debt, private debt, loan-to-value ratio, borrowing constraints, sovereign risk premium, deleveraging, fiscal limits, DSGE JEL Codes: E44, E62, H63 ∗The views expressed in this paper are those of the authors and do not necessarily represent those of the International Monetary Fund or IMF policy. All remaining errors are ours. yInternational Monetary Fund, 700 19th Street N.W., Washington, D.C. 20431, United States. E-mail: [email protected]. zInternational Monetary Fund, 700 19th Street N.W., Washington, D.C. 20431, United States; and Department of Economics, City University London, UK. E-mail: [email protected]. xCenter for Economic Studies, KU Leuven, Naamsestraat 69, 3000 Leuven, Belgium; and Depart- ment of Economics, University of Foggia, Italy. E-mail: [email protected]. 1 Introduction Seven years on the effects of the financial crisis are still being felt: global growth remains fragile and unbalanced, while signs of asset price overvaluation have started to re-emerge. The financial crisis is predominantly a story of excessive leverage fostered by mul- tiple causes. The most evident is the adoption of wide-spread practices in financial markets that supposedly were meant to get rid of risk when in fact they implied losing track of it. Many argue that central bankers and other regulators also bear blame, for they de facto ratified this irrational exuberance. The macroeconomic backdrop was important too. The “Great Moderation”—years of low inflation, low interest rates and stable growth—fostered complacency and risk-taking. A “savings glut” in Asia pushed down global interest rates. Some also implicate European banks, which bor- rowed greedily in American money markets before the crisis, and used the funds to buy questionable securities. All these factors came together to promote a surge of private debt—an extraordinary upward swing in the leverage cycle (Geanakoplos, 2010; Geanakoplos et al., 2012)—in what seemed to have become a less risky world. In practice, as it later became self- evident, not only risk had not gone away, but economies had become more vulnerable to it, given the extraordinary concentration of large stocks of liabilities in the hands of few investors. When the bubble burst, the massive debt accumulation in the private sector sparked a typical debt deflation dynamics (Fisher, 1933; Minsky, 1982) that propelled the ratio of public debt to GDP very rapidly. This occurred through two channels. The first worked through the automatic stabilizers, the recession-induced decline in government revenues, and a fall in the level of prices–including those of assets. The second consisted in governments actually taking over private debt gone sour as the crisis erupted (mostly bank debt). In several countries debt has continued to grow since the crisis, taking the ratio of the global stock of debt outstanding as a share of GDP to 286 from 269 percent, between end-2007 and mid-2014 (Figure 1). The hoped-for financial healing has happened only in a few scattered parts of the global economy. More specifically, in advanced countries, private sector debt–especially that held by financial companies such as banks–has come down. However, in some emerging market countries, debt continues to grow either in the private or public sectors, pushed also by global factors (Batsaikhan and Huttl, 2015; IMF, 2015; McKinsey, 2015) and posing 1 Advanced - 2000 Advanced - 2007 Advanced - 2014 300 300 300 250 250 250 200 200 200 CAN 150 150 150 JAP Public debtPublic (pc of GDP) 100 debtPublic (pc of GDP) 100 debtPublic (pc of GDP) 100 EA 50 USA 50 50 AUS UK 0 0 0 0 100 200 300 0 100 200 300 0 100 200 300 Private debt excl FC (pc of GDP) Private debt excl FC (pc of GDP) Private debt excl FC (pc of GDP) EMEs - 2000 EMEs - 2007 EMEs - 2014 70 70 70 BRA 60 IND 60 60 50 50 50 SA 40 40 40 30 RUS CHI 30 30 20 20 20 Public Debt Public(pc of GDP) Debt Public(pc of GDP) Public Debt Debt Public(pc of GDP) 10 10 10 0 0 0 0 100 200 0 100 200 0 100 200 Private Debt excl FC (pc of GDP) Private Debt excl FC (pc of GDP) Private Debt excl FC (pc of GDP) Figure 1: Ratios of public and private (households and nonfinancial corporations) debt to GDP in selected advanced and emerging market economies in 2000 (red balls), 2007 (pink balls) and 2014 (yellow balls). Area of balls proportional to GDP. Source: Haver analytics. new risks to financial stability and the recovery. Although the level of leverage is higher in developed markets, the speed of the recent leverage process in emerging economies, and especially in Asia, is indeed an increasing concern as these countries might be the epicentre of the next crisis. As a result of these dynamics, we are now left with simultaneously large private and public overhangs at a global level. In advanced countries, albeit heterogenous, a slow process of deleveraging amidst economic weakness, has begun. By contrast, emerging market economies continue to face a poisonous combination of rising leverage and slow- ing growth. In this environment, growth is severely limited by borrowing constraints and/or deleveraging of both household, non-financial as well as financial corporations and government, which mutually reinforce their negative impact on activity in the near run. Traditionally post-financial-crisis deleveraging is lengthy, and it is thus reasonable to expect that the restraint on near-term growth will spill over to potential growth, 2 with adverse consequences for both private and public finances sustainability. The fall in inflation rates in many countries is complicating debt repayment. It is no surprise, then, that the world economy is still struggling to generate a convincing recovery. This paper derives a model of the economy that stylizes the development of leverage cycles and embeds links between private and public debt dynamics. The basic struc- ture follows Kiyotaki and Moore (1997)’s model of credit cycles that shows how small shocks to the economy might be amplified by credit restrictions, giving rise to large output fluctuations; and it embeds Iacoviello (2005)’s modifications to replicate fea- tures of borrowing constraints in the housing market within a New-Keynesian setting. It is then enriched with elements of the literature on government debt and sovereign risk premium (Corsetti et al., 2013; Bi and Traum, 2014), on one side, and on government intervention in the intermediation of funds (Gertler and Karadi, 2011), on the other side. Thus, our model accounts explicitly for the two key links between private and public indebtedness that characterize debt deflation dynamics: first, through the financial accelerator, private deleveraging affects output and prices, which in turn depresses government revenues; and second, public debt is affected by government in- terventions to alleviate private borrowing constraints, and mitigate the consequences of private deleveraging on output and prices. This way we capture how excessive private leverage can infect public finances, and weigh on growth; and we can also track the way in which, in turn, increases in public debt associated with financial assistance to the private sector require fiscal consolidation, depressing income and thus aggravating private deleveraging, conditional on the mix of demand and macroprudential policies. The model’s shocks and great ratios are calibrated on average euro area data. Under this calibration, the model can reproduce the classical pattern of leverage cycles, and captures well the dynamic correlation between private and public debt observed in the data of key European countries. We simulate the model to identify policies that can contain leverage cycles, and reduce their adverse effects on economic growth while preserving fiscal sustainability. Specifically, we focus on four main macro-fiscal and macro-prudential policy ques- tions: 1. How does the relative weight of private versus public debt in total debt affect the downward phase of a leverage cycle? We find that, con- trary to popular belief, high private debt—rather than high public debt—is a more serious source of macro-fiscal vulnerability: the higher the level of private 3 leverage–regardless of the level of public debt up to very high levels–the greater the contraction and deflation following adverse shocks.

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